Weeding composition and application thereof

Abstract

The invention relates to the technical field of pesticides, and discloses a weeding composition and application thereof. The composition comprises an active component A and an active component B, the active component A is dithiopyr, and the active component B is selected from fenclorim and mefenpyr-diethyl. The herbicide composition can obviously relieve the phytotoxicity of dithiopyr to rice and effectively expand the application window period of dithiopyr, so that the composition can be safely applied after direct seeding of rice and before and after transplanting of transplanted rice. While ensuring efficient prevention and removal of weeds such as barnyard grass, leptochloa chinensis, digitaria sanguinalis, monochoria vaginalis, rhizoma alismatis, cyperus difformis and the like, the weeding composition remarkably improves the safety of crops, has an obvious yield increasing effect, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of pesticide technology, specifically to a herbicidal composition and its application, and more particularly to a composition containing thiophanate-methyl and its application. Background Technology

[0002] Dithiopyr is a pyridine carboxylic acid pre-emergence herbicide. Its mechanism of action is to inhibit plant cell mitosis. It has excellent control effects on annual grass weeds in rice fields, such as barnyard grass and Echinochloa crus-galli, and has therefore been widely used in transplanted rice fields for a long time.

[0003] Fluthion, as a pre-emergence herbicide, is widely used in transplanted rice fields, but its application in direct-seeded rice in the early post-planting period poses a risk of phytotoxicity, thus limiting its application window.

[0004] Although the existing technology CN202211532413.5 attempts to use fluthion in direct-seeded rice fields, for safety reasons, it has to limit its application time to after the rice seedling stage. This greatly limits the flexibility of the herbicide in direct-seeded rice production and the need for early weed control. It cannot effectively control weeds during the critical weed occurrence period of "post-sowing and pre-emergence", and cannot meet the urgent need for early pre-emergence weed control in direct-seeded rice production.

[0005] To address the phytotoxicity problem caused by herbicides, safeners are commonly used in the pesticide industry. Safeners typically exhibit high selectivity, and their detoxification effect is closely related to the mechanism of action of the herbicide, often limited to specific herbicide categories. However, no safener has yet been found to alleviate the safety issues associated with flufenoxuron.

[0006] Pyrazosulfuron is a pyrimidine-based herbicide safener that protects crops and the environment by eliminating herbicide residues in the soil. It can be used to protect rice from pretilachlor. In the pesticide industry, it is generally believed that pyrazosulfuron can only be used to mitigate the effects of amide herbicides, especially pretilachlor.

[0007] Therefore, there is an urgent need in the field for a composition that can overcome the safety barriers of fluthion in the early post-sowing stage of direct-seeded rice, effectively alleviate the phytotoxicity of fluthion to rice, significantly broaden its safe application window, and especially enable it to be safely used as a herbicidal composition in the critical period of "post-sowing and pre-emergence" of direct-seeded rice. Summary of the Invention

[0008] The purpose of this invention is to overcome the problems existing in the prior art and provide a herbicidal composition that improves the safety of fluthion and its application.

[0009] The combined use of fluthiamethoxam and a safener (selected from pyrazosulfuron and pyrazosulfuron) effectively alleviates the phytotoxicity caused by fluthiamethoxam in rice applications, especially solving the technical problem of unsafe application in the early post-sowing stage of direct-seeded rice, thereby significantly extending the application window of fluthiamethoxam.

[0010] To achieve the above objectives, the first aspect of the present invention provides a herbicidal composition that can significantly improve the safety of flusulfuron to rice crops, the herbicidal composition comprising active ingredient A and active ingredient B, wherein active ingredient A is flusulfuron, and active ingredient B is selected from pyrazosulfuron and pyrazosulfuron-methyl.

[0011] The mass ratio of flusulfanilamide to pyrazosulfuron or pyrazosulfuron is in the range of 2:1 to 1:10; preferably, the mass ratio is in the range of 2:1 to 1:4; more preferably, the mass ratio is in the range of 1:1 to 1:4; and most preferably, the mass ratio is in the range of 1:1 to 1:3.

[0012] The dosage form of the composition is selected from any one of dispersible tablets, granules, soluble powders, soluble granules, soluble tablets, tablets, milk powders, milk granules, water-dispersible granules, wettable powders, microcapsule granules, powders, large granules, water-dispersible tablets, microcapsule suspensions, dispersible liquids, emulsifiable concentrates, milk granules, milk powders, water emulsions, microemulsions, dispersible oil suspensions, oil-dispersible powders, suspensions, suspension emulsions, soluble concentrates, and ultra-low volume liquids; preferably, the dosage form is any one of emulsifiable concentrates, water-dispersible granules, wettable powders, and dispersible oil suspensions; more preferably, the dosage form is an emulsifiable concentrate or a water emulsion.

[0013] The composition contains pesticide-suitable adjuvants, which include one or more of the following: solvents, dispersants, emulsifiers, wetting agents, disintegrants, thickeners, stabilizers, carriers, antifreeze agents, dispersion media, or fillers.

[0014] A second aspect of the present invention provides an application of the weeding composition described in the first aspect for controlling unwanted plants in different scenarios. The unwanted plants are weeds, selected from at least one of grass weeds, broadleaf weeds, and sedges; preferably at least one of barnyard grass, barnyard grass, crabgrass, duckweed, water plantain, and sedge; more preferably barnyard grass, barnyard grass, and crabgrass.

[0015] Preferably, the application scenario is rice or lawn; more preferably, the rice is direct-seeded rice or transplanted rice; most preferably, it is direct-seeded rice after sowing.

[0016] The third aspect of the present invention provides a method for applying the herbicidal composition according to the first aspect, wherein the application method is spraying, bottle spraying, granule application, or toxic soil application, as well as other herbicide treatment methods that can uniformly apply the herbicide to the target, and can be applied by aircraft, mechanical spraying, or manual application.

[0017] The active components of the herbicidal composition are applied in a mixed or sequential manner; preferably, the active components of the herbicidal composition are applied simultaneously in formulation form.

[0018] When the rice is direct-seeded rice, the application rate of active ingredient A is 72-144 gai / ha, the application rate of active ingredient B is 72-432 gai / ha, more preferably the application rate of active ingredient A is 72-108 gai / ha, and the application rate of active ingredient B is 72-162 gai / ha; the composition is applied after the direct-seeded rice is sown, preferably after the direct-seeded rice is sown. When the rice is transplanted, the application rate of active ingredient A is 72-216 gai / ha, and the application rate of active ingredient B is 72-648 gai / ha. More preferably, the application rate of active ingredient A is 108-216 gai / ha, and the application rate of active ingredient B is 108-432 gai / ha. The composition is applied before or after rice transplanting. When the rice is direct-seeded rice, the application rate of active ingredient A is 72-144 gai / ha, and the application rate of active ingredient B is 72-432 gai / ha.

[0019] The beneficial technical effects achieved by the present invention through the above technical solution are as follows: The herbicidal composition provided by the present invention significantly improves the safety for rice crops and can be safely applied after direct-seeded rice sowing and before or after transplanting transplanted rice, thereby effectively expanding the applicable window period of flufenoxuron. Furthermore, this composition exhibits excellent control effects on difficult-to-control and resistant gramineous weeds in rice fields, such as barnyard grass, Echinochloa crus-galli, and Digitaria sanguinalis, with a broad spectrum of herbicides and a long residual effect.

[0020] When using this herbicidal composition, in addition to using the active ingredient directly, the composition containing the target active ingredient can be formulated, or the active ingredients can be formulated separately and then mixed together; other herbicides can also be added and mixed together. During application, each active ingredient of this application can be applied separately or simultaneously, making it flexible and convenient to use. Detailed Implementation

[0021] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0022] The first aspect of the present invention provides a herbicidal composition, wherein the herbicidal composition comprises active ingredient A and active ingredient B, wherein active ingredient A is flusulfanilamide, and active ingredient B is selected from pyrazosulfuron-methyl and pyrazosulfuron-methyl, wherein the amount of active ingredient is the effective amount.

[0023] The herbicidal composition of this invention has high efficacy, long-lasting effect, broad spectrum of weed control, and high safety for subsequent crops. Furthermore, this composition can be applied to various applications such as paddy fields and lawns.

[0024] Typical, but not limiting, ratios of active ingredient A and active ingredient B are, for example, 3:1, 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, or 1:10.

[0025] In some embodiments of the present invention, when the active ingredient B is chlorpyrifos, the mass ratio of flusulfanilamide to chlorpyrifos ranges from 2:1 to 1:10; preferably, the mass ratio ranges from 2:1 to 1:4; more preferably, the mass ratio ranges from 1:1 to 1:4; and most preferably, the mass ratio ranges from 1:1 to 1:3.

[0026] In some embodiments of the present invention, when the active ingredient B is pyrazosulfuron-methyl, the mass ratio of flusulfuron-methyl to pyrazosulfuron-methyl ranges from 2:1 to 1:10; preferably, the mass ratio ranges from 2:1 to 1:4; more preferably, the mass ratio ranges from 1:1 to 1:4; and most preferably, the mass ratio ranges from 1:1 to 1:3.

[0027] In some embodiments of the present invention, the herbicidal composition formulation is selected from any one of dispersible tablets, granules, soluble powders, soluble granules, soluble tablets, tablets, emulsion powders, emulsion granules, water-dispersible granules, wettable powders, microcapsule granules, powders, large granules, water-dispersible tablets, microcapsule suspensions, dispersible liquids, emulsifiable concentrates, emulsion granules, emulsion powders, water emulsions, microemulsions, dispersible oil suspensions, oil-dispersible powders, suspensions, suspension emulsions, soluble concentrates, and ultra-low volume liquids; preferably, the formulation is any one of emulsifiable concentrates, water-dispersible granules, wettable powders, and dispersible oil suspensions; more preferably, the formulation is an emulsifiable concentrate or a water emulsion.

[0028] In some embodiments of the present invention, the herbicide composition contains adjuvants commonly used in pesticide formulations to prepare various formulations suitable for agricultural use. The adjuvants include one or more of the following: solvents, dispersants, emulsifiers, wetting agents, disintegrants, thickeners, stabilizers, carriers, antifreeze agents, dispersion media, or fillers.

[0029] In a preferred embodiment of the present invention, the solvent includes aromatic solvent oil, toluene, xylene, N-methylpyrrolidone, N,N-dimethylformamide, tributyl phosphate, tetrahydrofurfuryl alcohol, 2-ethylhexanol, n-octanol, 2-methyl-2,4-pentanediol, 4-hydroxy-4-methyl-2-pentanone, methyl lactate, butyl lactate, cyclohexanol, benzyl alcohol, benzoyl benzoate, benzoyl lactate, γ-butyrolactone, dimethyl sulfoxide, tetrahydrofuran, cyclohexanone, epoxidized soybean oil, vegetable oil, paraffin oil, lubricating oil or solvent oil No. 100, No. 150, No. 180, No. 200, etc., and may also be other solvents commonly used in the art.

[0030] In a preferred embodiment of the present invention, the emulsifier is one or more of the following: agricultural emulsion 500, agricultural emulsion 600, agricultural emulsion 700, NP series, 0201B, 0203B, 2201, castor oil polyoxyethylene ether, fatty acid polyoxyethylene ether, polyoxyethylene fatty alcohol ether, ethoxylated castor oil, polymethyl acrylate, fatty acid polyethylene glycol ester, glycerol trilaurate polyoxyethylene ether, and ethylene oxide-propylene oxide block copolymer.

[0031] In some specific implementations, the antifreeze can be one or more of polyols (such as ethylene glycol, propylene glycol, glycerol), urea, calcium chloride, etc.

[0032] In some specific embodiments, the wetting agent may be one or more of sodium dodecyl sulfate, sodium dodecyl sulfonate, sodium alkyl naphthalene sulfonate, fatty alcohol polyethylene glycol ether sulfate, fatty alcohol polyethylene ether, nonylphenol polyoxyethylene ether, sorbitan fatty acid ester polyoxyethylene ether, alkyl naphthalene formaldehyde condensate, alkyl naphthalene sulfonate and anionic wetting agents.

[0033] In some specific embodiments, the dispersant may be one or more of NNO, sodium lignosulfonate, calcium lignosulfonate, sodium polyacrylate, methylene bis(naphthalene) sulfonate, alkylamino taurate, sodium methylene bis(naphthalene) sulfonate formaldehyde condensate, polyoxyethylene polyoxypropylene block copolymer, carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, sodium tripolyphosphate, and alkyl naphthalene sulfonate condensate.

[0034] In some specific embodiments, the thickener may be one or more of xanthan gum, polyvinyl alcohol, sodium alginate, sodium carboxymethyl cellulose, diatomaceous earth, starch, kaolin, and organobentonite.

[0035] In some specific embodiments, the carrier is one or more of the following: kaolin, diatomaceous earth, light calcium carbonate, silica, attapulgite, soluble starch, urea, amine fertilizer, glucose, maltose, sucrose, citric acid, anhydrous potassium carbonate, anhydrous potassium bicarbonate, anhydrous sodium sulfate, anhydrous sodium bicarbonate, anhydrous sodium carbonate, and anhydrous sodium bicarbonate.

[0036] A second aspect of the present invention provides an application of the weeding composition described in the first aspect for controlling unwanted plants in different scenarios; preferably, the application scenarios are rice paddies and lawns. More preferably, the rice is direct-seeded rice or transplanted rice.

[0037] In some embodiments of the present invention, the unwanted plant is a weed, including at least one of grass weeds, broadleaf weeds, and sedges, preferably barnyard grass, barnyard grass, crabgrass, duckweed, water plantain, and sedge, more preferably barnyard grass, barnyard grass, and crabgrass.

[0038] The third aspect of the present invention provides a method for applying the herbicidal composition according to the first aspect, wherein the application method is spraying, bottle spraying, granule application, or toxic soil application, as well as other herbicide treatment methods that can uniformly apply the herbicide to the target, and can be applied by aircraft, mechanical spraying, or manual application.

[0039] In some embodiments of the present invention, the active components of the herbicidal composition are applied in a mixed manner or sequentially; preferably, the active components of the herbicidal composition are applied simultaneously in formulation form.

[0040] In some embodiments of the present invention, when the rice is direct-seeded rice, the application rate of active ingredient A is 72-144 gai / ha, the application rate of active ingredient B is 72-432 gai / ha, more preferably the application rate of active ingredient A is 72-108 gai / ha, and the application rate of active ingredient B is 72-162 gai / ha; the composition is applied after the direct-seeded rice is sown, preferably after the direct-seeded rice is sown. When the rice is transplanted, the application rate of active ingredient A is 72-216 gai / ha, and the application rate of active ingredient B is 72-648 gai / ha. More preferably, the application rate of active ingredient A is 108-216 gai / ha, and the application rate of active ingredient B is 108-432 gai / ha. The composition is applied before or after rice transplanting. When the rice is direct-seeded rice, the application rate of active ingredient A is 72-144 gai / ha, and the application rate of active ingredient B is 72-432 gai / ha. More preferably, the application rate of active ingredient A is 72-108 gai / ha, and the application rate of active ingredient B is 72-162 gai / ha.

[0041] When using this herbicidal composition, the active ingredients can be used directly, or the composition containing the target active ingredient can be formulated, or the active ingredients can be formulated separately and then mixed. During application, the active ingredients of this invention can be applied separately or simultaneously.

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This patent was implemented through greenhouse pot cultivation and field plot trials. The pesticides used and their sources are shown in the table below.

[0044] Table 1. Test reagents and their sources (I) Methods and standards for determining herbicidal activity 1. Bioassay Test Methods: Refer to the Ministry of Agriculture and Rural Affairs' "NY / T 1155.3-2006 Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 3: Activity Assay Test - Soil Spray Method" and "NYT 1155.6-2006 Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 6: Safety Tests for Crops - Soil Spray Method".

[0045] Preparation of the medicine solution: Technical grade herbicide: Accurately weigh a certain mass of herbicide technical grade herbicide, dissolve it in DMF (dimethylformamide), add water containing 0.1% Tween 80 emulsifier, stir evenly, and prepare a solution of a certain concentration for later use.

[0046] 2. Evaluation Standards for Crop Safety by Visual Inspection Crop safety is evaluated by visual inspection: based on the damage symptoms of the target crop, 0 indicates safety, and 51-100 indicates very poor safety and serious phytotoxicity. The evaluation indicators are shown in the table below.

[0047] Table 2. Evaluation Criteria for Drug Damage 3. Evaluation criteria for herbicide activity by visual inspection Visual assessment of herbicidal activity is based on the degree of plant damage symptoms (inhibition, deformity, yellowing, whitening). 0 indicates no herbicidal effect, and 100% indicates complete killing of weeds. The evaluation criteria for visual assessment are shown in Table 3.

[0048] Table 3 Evaluation Criteria for Herbicidal Activity by Visual Inspection The formula for calculating the fresh weight inhibition rate is as follows: The experimental data were analyzed using the Duncan's new multiple range method in DPS 7.05 statistical analysis software to determine the significance of the differences in effects between different treatments (α = 0.05).

[0049] Screening test of fluthion + different safener components The greenhouse pot treatment method was adopted. A measured amount of soil was placed in plastic pots, and rice seeds were soaked and germinated until they showed white sprouts before sowing. The seeds were not covered with soil after sowing and were placed in a greenhouse for cultivation. Spraying was applied the day after rice sowing. Approximately 10 weed seeds were scattered on the soil surface, covered with 0.5–1 cm of fine soil, and placed in a greenhouse for cultivation. Pre-emergence soil spraying was applied after sowing. Each treatment was repeated four times. After treatment, the plants were placed in a greenhouse for cultivation, simulating soil moisture management in direct-seeded rice fields. Plant growth was observed regularly. Approximately 30 days after application, the overall growth inhibition was visually assessed, and the fresh weight of the plants was measured to calculate the fresh weight inhibition rate (%). Specific results are shown in Table 4.

[0050] Table 4. Screening results of fluthiazide + different safeners (inhibition rate %) The results showed that flufenoxuron alone was unsafe when applied to direct-seeded rice the day after sowing, with visual and fresh weight inhibition rates of 25.0% and 28.3%, respectively. Combinations of flufenoxuron with glyphosate and flufenoxuron with pyraclostrobin showed better safety in rice, with visual and fresh weight inhibition rates of 0–5% and 2.5–9.0%, respectively. Combinations of flufenoxuron with the aforementioned safeners showed good overall control efficacy against barnyardgrass, with visual and fresh weight inhibition rates of 90.0–97.3%.

[0051] (III) Screening test of flusulfanilamide + glyphosate ratio The test method is the same as (II).

[0052] Table 5. Screening results of flufenoxuron + glyphosate ratio (inhibition rate %) Extensive experimental design yielded the above screening test data. The results showed that flufenoxuron alone, applied to direct-seeded rice the day after sowing, exhibited visual and fresh weight inhibition rates of 30.0% and 35.6%, respectively. The combination of flufenoxuron and glyphosate significantly improved the safety of rice. A mass ratio of flufenoxuron to glyphosate within the range of 1:1 to 1:4 showed the best safety improvement, with visual and fresh weight inhibition rates of 0–5% and -15.4–8.5%, respectively. A mass ratio within the range of 1:1 to 1:3 demonstrated good safety for rice and good control of barnyard grass, with visual and fresh weight inhibition rates of 85–94% and 86.5–95.3%, respectively.

[0053] (iv) Screening test of the ratio of flusulfanilamide + pyrazole herbicides The test method is the same as (II).

[0054] Table 6. Screening results of flufenoxuron + pyrazosulfuron ratio (inhibition rate %) The results showed that flufenoxuron alone was unsafe when applied to direct-seeded rice the day after sowing, with visual and fresh weight inhibition rates of 30.0% and 31.3%, respectively. The combination of flufenoxuron and pyrazosulfuron significantly improved the safety of rice, with a ratio of 1:1 to 1:4 showing the best safety enhancement, with visual and fresh weight inhibition rates of 0.0–5.0% and -11.6–4.2%, respectively. A ratio of flufenoxuron to pyrazosulfuron within the range of 1:1 to 1:3 showed good safety in rice and high efficacy against barnyard grass, with visual and fresh weight inhibition rates of 85–94.5% and 86.8–95.7%, respectively.

[0055] (v) Herbicide composition formulation and efficacy determination 1. Formulation Examples and Comparative Examples The composition formulations used in this experiment include the following proportions from the examples: Example 1: 20% Fluthion·Ulvaproin EC Example 2: 30% Fluthion·Ulvaproin EC (Emulsifiable Concentrate) Example 3: 20% Flufenoxuron·Pyrazosulfuron EC (Emulsifiable Concentrate) Example 4: 30% Flufenoxuron·Pyrazosulfuron EC (emulsifiable concentrate) Comparative Example 1: Compared with Example 1, the active ingredient was fluthiazide, and the insufficient part was supplemented by solvent.

[0056] 2. Efficacy Evaluation of Examples and Comparative Examples 2.1 Direct-seeded rice Based on the national standard GB / T 17980.40-2000 Field Efficacy Test Guidelines for Pesticides (I) Herbicides for Controlling Weeds in Rice Fields, a field plot experiment was conducted. The experiment was held in Xuyu Village, Huangmei County, Hubei Province. The experimental field was flat, with complete irrigation and drainage facilities, consistent field management, and uniform to moderate fertility. The soil was loam with a slightly neutral pH. Land preparation was carried out on June 10th using a small tractor-tiller. The rice variety was a local conventional indica rice, sown manually on June 11th at a fixed rate of 10 catties / mu. The main weeds in the experimental field were *Echinochloa crus-galli* and *Cyperus difformis*, which occurred evenly.

[0057] This experiment used Examples 1, 4, and Comparative Example 1. The experimental plots were arranged in a randomized block design, with a plot area of ​​21 m². 2 The plots were rectangular, and each treatment was replicated three times. The herbicide was applied the day after rice sowing using a sprayer (30 L / mu) for uniform spraying. Weed control efficacy was assessed approximately 30 days after application using visual inspection. Yield was measured for each plot at harvest time. The results are shown in Table 7.

[0058] Table 7 Results of application of flufenoxuron + safener on the day after direct-seeded rice. * indicates that different lowercase letters in the same column represent significant differences. P <0.05).

[0059] The results of application the day after sowing showed that Examples 1 and 4 had good safety for direct-seeded rice, which was better than Comparative Example 1, and had a significant yield-increasing effect; they also had high control efficacy against Echinochloa crus-galli and Cyperus difformis.

[0060] 2.2 Transplanting rice Based on the standard GB / T 17980.40-2000 "Guidelines for Field Efficacy Testing of Pesticides (I) - Control of Weeds in Rice Fields by Herbicides", a field plot test method was adopted. The experiment was conducted in Jiamusi City, Heilongjiang Province. The experimental field was flat, with complete irrigation and drainage facilities, consistent field management, and uniform to moderate fertility. The soil was loam with a slightly neutral pH. Land preparation was carried out on May 1st, rice transplanting on May 9th, and herbicide application on May 14th. A combined harrowing and rotary tillage machine was used for land preparation. The rice variety was a local conventional rice variety. The main weeds in the experimental field were barnyard grass and water plantain, which occurred evenly.

[0061] This experiment used the formulations from Examples 1, 4, and Comparative Example 1. The experimental plots were arranged in a randomized block design, with a plot area of ​​22.5 m². 2Each treatment was repeated three times. The herbicide was applied one day after rice transplanting using a sprayer, diluted with water and sprayed evenly. Weed control efficacy was assessed approximately 30 days after application using visual inspection. Yield was measured for each plot at harvest time. The experimental results are shown in Table 8.

[0062] Table 8 Results of application of flufenoxuron + safener in transplanted rice after transplanting * This means that different lowercase letters in the same column indicate significant differences. P <0.05).

[0063] The results of the post-planting application test of transplanted rice showed that Examples 1 and 4 had good safety for rice, which was better than Comparative Example 1, and had a significant yield-increasing effect; they also had high efficacy against barnyard grass and Alisma plantago-aquatica.

[0064] 2.3 Direct-seeded rice in dryland areas In accordance with the national standard GB / T 17980.40-2000 Field Efficacy Test Guidelines for Pesticides (I) Herbicides for Controlling Weeds in Rice Fields, a field plot experiment was conducted. The experiment was held in Sihong County, Jiangsu Province. The experimental field was flat, with complete irrigation and drainage facilities, consistent field management, and uniform to moderate fertility. The soil was loam with a slightly neutral pH. Land preparation was carried out on June 6th using a combined tillage machine. The rice variety was a local conventional japonica rice variety, sown two days later using a rotary tillage and fertilization seeder, with quantitative sowing. The main weeds in the experimental field were barnyard grass and crabgrass, which occurred evenly.

[0065] This experiment used Examples 2, 3, and Comparative Example 1. The experimental plots were arranged in a randomized block design, with a plot area of ​​21 m². 2 The plots were rectangular, with each treatment replicated four times. Pre-emergence herbicide treatment was applied after rice sowing using a sprayer, diluted with water and sprayed evenly onto the soil. Weed control efficacy was assessed approximately 30 days after application using visual inspection. Yield was measured for each plot at harvest time. The results are shown in Table 9.

[0066] Table 9 Results of application of flufenoxuron + safener in direct-seeded rice. * indicates that different lowercase letters in the same column represent significant differences. P <0.05).

[0067] The results of this experiment show that Examples 2 and 3 have good safety for direct-seeded rice and a significant yield-increasing effect; moreover, they have high efficacy against barnyard grass and crabgrass. Therefore, this composition, when applied to direct-seeded rice before emergence, has good safety for rice and high weed control efficacy, and has good application prospects.

[0068] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A herbicidal composition, characterized in that, The herbicidal composition comprises active ingredient A and active ingredient B, wherein active ingredient A is flusulfanilamide and active ingredient B is selected from pyrazosulfuron-methyl and pyrazosulfuron-methyl.

2. The herbicidal composition according to claim 1, characterized in that, When the active ingredient B is chlorpyrifos, the mass ratio of flusulfanilamide to chlorpyrifos ranges from 2:1 to 1:10; preferably, the mass ratio ranges from 2:1 to 1:4; more preferably, the mass ratio ranges from 1:1 to 1:4; and most preferably, the mass ratio ranges from 1:1 to 1:

3.

3. The herbicidal composition according to claim 1, characterized in that, When the active ingredient B is pyrazosulfuron, the mass ratio of flusulfanilamide to pyrazosulfuron ranges from 2:1 to 1:10; preferably, the mass ratio ranges from 2:1 to 1:4; more preferably, the mass ratio ranges from 1:1 to 1:4; and most preferably, the mass ratio ranges from 1:1 to 1:

3.

4. The herbicidal composition according to any one of claims 1-3, characterized in that, The dosage form of the composition is selected from any one of dispersible tablets, granules, soluble powders, soluble granules, soluble tablets, tablets, milk powders, milk granules, water-dispersible granules, wettable powders, microcapsule granules, powders, large granules, water-dispersible tablets, microcapsule suspensions, dispersible liquids, emulsifiable concentrates, milk granules, milk powders, water emulsions, microemulsions, dispersible oil suspensions, oil-dispersible powders, suspensions, suspension emulsions, soluble concentrates, and ultra-low volume liquids; preferably, the dosage form is any one of emulsifiable concentrates, water-dispersible granules, wettable powders, and dispersible oil suspensions; more preferably, the dosage form is an emulsifiable concentrate or a water emulsion.

5. The herbicidal composition according to claim 4, characterized in that, The composition contains pesticide-suitable adjuvants, which include one or more of the following: solvents, dispersants, emulsifiers, wetting agents, disintegrants, thickeners, stabilizers, carriers, antifreeze agents, dispersion media, or fillers.

6. An application of the weeding composition of claim 5 to control unwanted plants in different scenarios; preferably, the application scenarios are rice paddies and lawns; More preferably, the rice is direct-seeded rice or transplanted rice.

7. The application according to claim 6, characterized in that, The unwanted plant is a weed, selected from at least one of grass weeds, broadleaf weeds, and sedges; preferably at least one of barnyard grass, barnyard grass, crabgrass, duckweed, water plantain, and sedge; more preferably barnyard grass, barnyard grass, and crabgrass.

8. A method for applying the herbicidal composition according to claim 5, characterized in that, The application method is selected from spraying, bottle spraying, granule application, or toxic soil application.

9. The application method according to claim 8, characterized in that, The active components in the herbicidal composition are applied in a mixed container or sequentially. Preferably, each active component of the herbicidal composition is applied simultaneously in formulation form.

10. The application method according to claim 9, characterized in that, When the rice is direct-seeded rice, the application rate of active ingredient A is 72-144 gai / ha, the application rate of active ingredient B is 72-432 gai / ha, more preferably the application rate of active ingredient A is 72-108 gai / ha, and the application rate of active ingredient B is 72-162 gai / ha; the composition is applied after the direct-seeded rice is sown, preferably after the direct-seeded rice is sown. When the rice is transplanted, the application rate of active ingredient A is 72-216 gai / ha, and the application rate of active ingredient B is 72-648 gai / ha. More preferably, the application rate of active ingredient A is 108-216 gai / ha, and the application rate of active ingredient B is 108-432 gai / ha. The composition is applied before or after rice transplanting. When the rice is direct-seeded, the application rate of active ingredient A is 72-144 gai / ha, and the application rate of active ingredient B is 72-432 gai / ha. More preferably, the application rate of active ingredient A is 72-108 gai / ha, and the application rate of active ingredient B is 72-162 gai / ha.

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